The HarperCollins version of the DC Universe seems to have pretty lax restrictions on jurisdiction, however, because they can also be spotted in Gotham City, helping Batman as part of the GCPD, as seen in Fright Club:

They investigate the scene of Killer Croc's crimes in Reptile Rampage:

They even show up in Batman Versus Bane, a kid-friendly tie-in to The Dark Knight Rises:

Now, here's where things get tricky: Not content with DC's Gotham City and Metropolis, they also show up in Marvel's New York, usually helping out Spider-Man. Here they are in Spider-Man versus Hydro Man, trying to figure out how to clean up after a cement-filled super-villain battle:

And here they are apprehending Eddie Brock in the pages of Spider-Man Versus Venom:

Cuffing the Vulture in the imaginatively titled Spider-Man Versus the Vulture:

And, in what is probably my favorite shot of the pair, being completely mystified by what they're supposed to do when a spider-themed luchador beats up a dude made of sand by turning him into glass in The Sandman Strikes:

With so many collars under their belt, it's no wonder they get all smug during Battle Against Doc Ock:

But while policework seems to be their primary occupation, it's not the only thing these two do in these books. In Going Ape, they show up as a pair of Gotham City zookeepers that are threatened by Gorilla Grodd before Batman and Superman show up to intervene:

In The Toxic Terror, they're park rangers who run afoul of Poison Ivy:

And they even swap out their police uniforms and tuxedoes for a life of crime as two Bad Dudes-lookin' thugs who try to ransack the Batcave itself in Dawn of the Dynamic Duo:

So just what is going on with these guys? Is HarperCollins trying to create a spin-off? Are they subtly teaching kids pattern recognition skills? Are they, as doubtful as it might seem, sowing the seeds of a massive, world-shaking crossover in their line of young readers' titles?

We have no idea. But we do know that these two are no longer limited to kids' books. As reported by iFanboy, they crossed over last year into the actual DC Universe with Gates of Gotham #2...

...a comic drawn by Trevor McCarthy and co-written by Kyle Higgins and Scott Snyder. Considering that that comic was set in the 1870s, these guys could show up anywhere. Keep watching the backgrounds for those unfortunate facial hair choices!

__________________Salani kahle = "Stay well" in the isiZulu Language.Zum leben un gesund "to life and health" in German
(Whisper) "CARGIL is trying out for and trying HARD to be an X-man - I am SOOOO Jazzed about this simple thing."